IS 9120 : 1979 Guidelines for planning, layout and design of cavities in underground hydro-electric power stations
| UDC 627.85.035.04 : 621.311.21 : 624.04 | WRD 15 |
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| Reaffirmed 2023 |
1 Scope
1.1 This standard covers the guidelines for planning, layout anddesign of cavities in underground hydroelectric power stations.